| 1 | /* |
| 2 | * s390x linux replacement vdso. |
| 3 | * |
| 4 | * Copyright 2023 Linaro, Ltd. |
| 5 | * |
| 6 | * SPDX-License-Identifier: GPL-2.0-or-later |
| 7 | */ |
| 8 | |
| 9 | #include <asm/unistd.h> |
| 10 | #include "vdso-asmoffset.h" |
| 11 | |
| 12 | .macro endf name |
| 13 | .globl \name |
| 14 | .type \name, @function |
| 15 | .size \name, . - \name |
| 16 | .endm |
| 17 | |
| 18 | .macro raw_syscall n |
| 19 | .ifne \n < 0x100 |
| 20 | svc \n |
| 21 | .else |
| 22 | lghi %r1, \n |
| 23 | svc 0 |
| 24 | .endif |
| 25 | .endm |
| 26 | |
| 27 | .macro vdso_syscall name, nr |
| 28 | \name: |
| 29 | .cfi_startproc |
| 30 | aghi %r15, -(STACK_FRAME_OVERHEAD + 16) |
| 31 | .cfi_adjust_cfa_offset STACK_FRAME_OVERHEAD + 16 |
| 32 | stg %r14, STACK_FRAME_OVERHEAD(%r15) |
| 33 | .cfi_rel_offset %r14, STACK_FRAME_OVERHEAD |
| 34 | raw_syscall \nr |
| 35 | lg %r14, STACK_FRAME_OVERHEAD(%r15) |
| 36 | aghi %r15, STACK_FRAME_OVERHEAD + 16 |
| 37 | .cfi_restore %r14 |
| 38 | .cfi_adjust_cfa_offset -(STACK_FRAME_OVERHEAD + 16) |
| 39 | br %r14 |
| 40 | .cfi_endproc |
| 41 | endf \name |
| 42 | .endm |
| 43 | |
| 44 | vdso_syscall __kernel_gettimeofday, __NR_gettimeofday |
| 45 | vdso_syscall __kernel_clock_gettime, __NR_clock_gettime |
| 46 | vdso_syscall __kernel_clock_getres, __NR_clock_getres |
| 47 | vdso_syscall __kernel_getcpu, __NR_getcpu |
| 48 | |
| 49 | /* |
| 50 | * TODO unwind info, though we're ok without it. |
| 51 | * The kernel supplies bogus empty unwind info, and it is likely ignored |
| 52 | * by all users. Without it we get the fallback signal frame handling. |
| 53 | */ |
| 54 | |
| 55 | sigreturn_region_start: |
| 56 | __kernel_sigreturn: |
| 57 | raw_syscall __NR_sigreturn |
| 58 | endf __kernel_sigreturn |
| 59 | |
| 60 | __kernel_rt_sigreturn: |
| 61 | raw_syscall __NR_rt_sigreturn |
| 62 | endf __kernel_rt_sigreturn |
| 63 | sigreturn_region_end: |